/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.module.datalogging.web.controller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.openmrs.api.context.Context;
import org.openmrs.module.datalogging.configuration.Variable;
import org.openmrs.module.datalogging.service.DataLoggingService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

/**
 *
 */
@Controller
@RequestMapping("/module/datalogging/variableFinder")
public class VariableFinderController {
	
	/** Logger for this class and subclasses */
	private static final Log log = LogFactory.getLog(LogicFinderController.class);
	
	@RequestMapping(method = RequestMethod.GET)
	public void tokenAutoComplete(@RequestParam("searchTerm") String searchTerm, HttpServletResponse response) throws IOException {
		if (Context.isAuthenticated()) {
			response.setContentType("application/json");
			DataLoggingService service = Context.getService(DataLoggingService.class);
			List<Variable> variables = service.findComponents(searchTerm);
			
			if (log.isDebugEnabled())
				log.debug("Found: " + variables.size() + " unique filtering object ...");
			
			OutputStream stream = response.getOutputStream();
			
			JsonFactory f = new JsonFactory();
			JsonGenerator g = f.createJsonGenerator(stream, JsonEncoding.UTF8);
			g.useDefaultPrettyPrinter();
			
			g.writeStartObject();
			g.writeArrayFieldStart("elements");
			
			for (Variable variable : variables) {
				g.writeStartObject();
				g.writeStringField("id", String.valueOf(variable.getVariableId()));
				g.writeStringField("name", variable.getName());
				g.writeStringField("description", variable.getDescription());
				g.writeEndObject();
			}
			g.writeEndArray();
			g.writeEndObject();
			
			g.close();
		}
	}
	
}
